Oh, lourdy, I hope someone has ideas, because lately my ds6 is the exact same way. A sample conversation that we had the other day:
ds: Mama, do you know what 12x13 is?
Me: Um, 156.
ds: No, 154!
Me: No, honey, I think it's 156.
ds: No, really, it's 154! REALLY! REALLY, mama, I'm right!
Me: <sigh> Ds, what is 12x12?
ds: 144 -- oh, you're right, it's 156.
It happens several times a day and is starting to get irritating. It's usually with quick mental math errors he makes, but sometimes it's about some random fact, and those are harder to prove if we don't have a computer nearby. I've resorted to whipping out my iPhone to prove that a cheetah is really the fastest land animal and that it really *does* go 70 mph!
So no suggestions, just commiseration.
